A Global Push Fixed the Ozone Hole. Satellites Could Threaten It.

Low-Earth orbit, a layer of superhighway that wraps around Earth’s thermosphere some 200 to 600 miles…

Two Killer Asteroids Are Flying by Earth, and You May Be Able to See One

This week, two asteroids — one big enough to destroy a city, and the other so…

He Monitors Solar Flares. Here’s What Keeps Him Up at Night.

In May, the National Oceanic and Atmospheric Administration issued a watch for a possible solar storm.…

China Prepares to Land Moon Rocks From Lunar Far Side to Earth

On Tuesday, a capsule carrying soil from the far side of the moon will parachute into…

NASA Cancels Spacewalk Over Spacesuit Water Leak

A spacewalk by two NASA astronauts at the International Space Station ended almost as soon as…

An Odd Rock in a Box Gets Linked to a Shooting Star That Fell 54 Years Ago

Tens of thousands of meteorites have been found on Earth, but a vast majority remain shrouded…

Piping Up at the Gates of Dawn

Since the James Webb Space Telescope began operating two years ago, astronomers have been using it…

Summer Solstice 2024: Why It’s the Longest Day of the Year

On Thursday, everyone in the northern half of our planet will experience the summer solstice. It’ll…

Voyager 1, After Major Malfunction, Is Back From the Brink, NASA Says

Several months after a grave computer problem seemed to spell the end for Voyager 1, which…

Edward Stone, 88, Physicist Who Oversaw Voyager Missions, Is Dead

Edward C. Stone, the visionary physicist who dispatched NASA’s Voyager spacecraft to run rings around our…